JEE Main Physics question
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 min is equal to [AMU (Med.) 2002]
Answer: (D)
Solution
Time to market h min. Remaining 10 min h at 7.5 km/h covers km
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